From patchwork Tue Feb 28 21:37:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 62611 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:5915:0:0:0:0:0 with SMTP id v21csp3267158wrd; Tue, 28 Feb 2023 13:39:08 -0800 (PST) X-Google-Smtp-Source: AK7set+TpdXgBYcRy9X5UzvpADKV1cO6ijhC64xoyT8DF4baOo5KrK7qHznYd2DmlA/VEEBvUGXC X-Received: by 2002:a17:90a:19c5:b0:233:e0d5:a2b8 with SMTP id 5-20020a17090a19c500b00233e0d5a2b8mr4748286pjj.29.1677620348325; Tue, 28 Feb 2023 13:39:08 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1677620348; cv=none; d=google.com; s=arc-20160816; b=s+eyD5HtSFY0Sg1eTjM5vUNs2sDWSwgARZRv7Akz1Wq15YawIJj+e1lO8InJdP0by5 D7buKnWVAmG5BdYzk5NsM9Hb9AjOKVltKs/zmSJ+zOJyYpo9kcWq/uPr0xOH1Arq7qCi xA6BfcrPvllQmrxqJGRNivplr7gT9lU8ukAmom+CRINoqpw4xzal8T/ttxJay9W3BroY H0yy8pWtzNbIKZlEECi4tADkbvmOGvZWgKaxJdF9GwZxvuJQtY3h0jvCoCek9Nvt3aMs LhHpLPr+90Fp2l/ZIWqpbK04X6uoGLvYy5b5ejqJapNOJwhs2ub88kStgxtPG2sdxb2S 5TqQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=4/i61ZL50yz6ye25FSWBiGacTMwROTdk2fb5bLUdjZQ=; b=CDddKLiY8BNqzChScRdVSsQo81cGWdnSSnrPdCd66ceujnDSkmGlwnatTHDle9Xnvf S8SMeSOh12mM+KohmSfPbadDI+HCxelBHIh3ZLcvcAWlbFqglk/ms34H/0pOcR9FBx0/ IdIMd6rN5+ldFEIkwmpdbra5eQu8mbuowdK5wg+iqnlt1sjOGmbG2ArubS0IL8Ory1mg B5abqk1DOqzwsMGq3uscaEEVG2pl2YjwyZ7c9GStZZIEQa7eMnfcZ2ASHa6yJGwtQOQh /hqwC1y0W5dBCulUQshyZkT+qkYxwuieHp8AB5ClUyy9lbigckcGXpOj9cUAsV64jY6Z 4djQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=V7oeXdyW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id m3-20020a632603000000b0050324795c32si11299427pgm.319.2023.02.28.13.38.55; Tue, 28 Feb 2023 13:39:08 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=V7oeXdyW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229947AbjB1Vhv (ORCPT + 99 others); Tue, 28 Feb 2023 16:37:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229836AbjB1Vhp (ORCPT ); Tue, 28 Feb 2023 16:37:45 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF8D73403E; Tue, 28 Feb 2023 13:37:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=4/i61ZL50yz6ye25FSWBiGacTMwROTdk2fb5bLUdjZQ=; b=V7oeXdyWrSBQgRuryxvAjDdmK/ PmEA/0paMrtQ6HBE6tePsYJZz6k8Eh2IV/Cduw5PCatHygY5uf1HHh9QXAJPpxd+2Gt1XNNJ38oBs 7jgK2jLi0kEqTGbXcVMBwUjbU8B8InVRi5eVhNtY/7bIXj5PQ0pDmofSBVZsUlt31MoRZzGWn21xe ShtzNNaoqjpLDJEoZAQx6SbSpLUGkzQUxHAln8/TjK2Ab5c/gDiu2+elc2SGxedi70Wnn4dR15nyK UfY0ANK45Jvq1+6mUEFQF1tYFeZx/1od4+UoclrTdV+pqDp7Fq4FbeDqoDP2CwXIOnaiRJmBGcjTR 1cStI3qg==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pX7fH-0018oY-P6; Tue, 28 Feb 2023 21:37:39 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org, linux-arch@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org Subject: [PATCH v3 03/34] mm: Add folio_flush_mapping() Date: Tue, 28 Feb 2023 21:37:06 +0000 Message-Id: <20230228213738.272178-4-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230228213738.272178-1-willy@infradead.org> References: <20230228213738.272178-1-willy@infradead.org> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1759112434084795220?= X-GMAIL-MSGID: =?utf-8?q?1759112434084795220?= This is the folio equivalent of page_mapping_file(), but rename it to make it clear that it's very different from page_file_mapping(). Theoretically, there's nothing flush-only about it, but there are no other users today, and I doubt there will be; it's almost always more useful to know the swapfile's mapping or the swapcache's mapping. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/pagemap.h | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 51b75b89730e..1b1ba3d5100d 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -369,6 +369,26 @@ static inline struct address_space *folio_file_mapping(struct folio *folio) return folio->mapping; } +/** + * folio_flush_mapping - Find the file mapping this folio belongs to. + * @folio: The folio. + * + * For folios which are in the page cache, return the mapping that this + * page belongs to. Anonymous folios return NULL, even if they're in + * the swap cache. Other kinds of folio also return NULL. + * + * This is ONLY used by architecture cache flushing code. If you aren't + * writing cache flushing code, you want either folio_mapping() or + * folio_file_mapping(). + */ +static inline struct address_space *folio_flush_mapping(struct folio *folio) +{ + if (unlikely(folio_test_swapcache(folio))) + return NULL; + + return folio_mapping(folio); +} + static inline struct address_space *page_file_mapping(struct page *page) { return folio_file_mapping(page_folio(page)); @@ -379,11 +399,7 @@ static inline struct address_space *page_file_mapping(struct page *page) */ static inline struct address_space *page_mapping_file(struct page *page) { - struct folio *folio = page_folio(page); - - if (unlikely(folio_test_swapcache(folio))) - return NULL; - return folio_mapping(folio); + return folio_flush_mapping(page_folio(page)); } /**